HistoricPublishStatusCallback (eBus Feed 7.4.0 API)

```
public interface HistoricPublishStatusCallback
```
An eBus client implementing IEHistoricPublisher may choose to implement this functional interface as a private method instead of implementing the public IEHistoricPublisher.publishStatus(EFeedState, EHistoricPublishFeed) method. This private HistoricPublishStateCallback method is then passed to EHistoricPublishFeed.Builder.statusCallback(HistoricPublishStatusCallback).
Note: this callback may only be set when building an EHistoricPublishFeed instance. Once built, the publisher feed status callback target may not be changed.

If not overridden or replaced with a HistoricPublishStatusCallback, IEHistoricPublisher.publishStatus(EFeedState, EHistoricPublishFeed) does nothing.

Author:

Charles W. Rapp

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`call(EFeedState feedState, EHistoricPublishFeed feed)`	`EHistoricPublishFeed` calls this method to inform a publisher that the notification feed state is either `EFeedState.UP` or `EFeedState.DOWN`.

- Method Detail
  - call
```
void call(EFeedState feedState,
          EHistoricPublishFeed feed)
```
    EHistoricPublishFeed calls this method to inform a publisher that the notification feed state is either EFeedState.UP or EFeedState.DOWN. This callback is provided as a courtesy only since historic publishers are always free to publish notification messages on an historic publish feed (as long as EHistoricPublishFeed.isFeedUp() returns true).
    
    Parameters:
    
    feedState - EFeedState.UP if there is at least one subscriber to this notification feed; otherwise set to EFeedState.DOWN.
    
    feed - historic publish feed reporting this feed state change.